Content-type: text/html Man page of modf

modf

Section: Mathematical Library Functions (3M)
Updated: 12 Jul 2006
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NAME

modf, modff, modfl - decompose floating-point number  

SYNOPSIS

c99 [ flag... ] file... -lm [ library... ]
#include <math.h>

double modf(double x, double *iptr);

float modff(float x, float *iptr);

long double modfl(long double x, long double *iptr);  

DESCRIPTION

These functions break the argument x into integral and fractional parts, each of which has the same sign as the argument. It stores the integral part as a double for the modf() function, a float for the modff() function, or a long double for themodfl() function in the object pointed to by iptr.  

RETURN VALUES

Upon successful completion, these functions return the signed fractional part of x.

If x is NaN, a NaN is returned and *iptr is set to NaN.

If x is ±Inf, ±0 is returned and *iptr is set to ±Inf.  

ERRORS

No errors are defined.  

USAGE

These functions compute the function result and *iptr such that:

a = modf(x, &iptr) ;
x == a+*iptr ;

 

ATTRIBUTES

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPEATTRIBUTE VALUE
Interface StabilityStandard
MT-LevelMT-Safe

 

SEE ALSO

frexp(3M), isnan(3M), ldexp(3M), attributes(5), standards(5)


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUES
ERRORS
USAGE
ATTRIBUTES
SEE ALSO

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Time: 02:39:32 GMT, October 02, 2010